Shale screen



July 23, 1940. G. D. CRABB SHALE SCREEN Original Filed Oct. 12, 1936 2Sheets-Sheet l G Zenwoocl Z7. 67'db&

ATTORNEYS G. D. CRABB SHALE SCREEN July 23,

Original Filed Oct. 12, 1936 2 Sheets-Sheet 2 HH HHHHH H HHHHHNIH-UHHHHHHH HHU-H-HflnH-H dz 672100061 1:. draw Patented July 23, 1940UNITED STATES.

PATENT OFFICE Application October 12, 1936, Serial No. 105,287 RenewedApril 23, 1940 1 Claim.

The invention relates to a screen and more especially to a shale screen.

The primary object of the invention is the provision of a screen of thischaracter, wherein the drilling mud or solution is separated from shale,sand and other detrimental particles, leaving the mud or solution cleanfor the return thereof to a well or hole.

Another object of the invention is the provision of a screen of thischaracter, which is simple in construction, thoroughly reliable andefficient in operation, strong, durable, and inexpensiv to manufactureand install.

With these and other objects in view the invention consists in thefeatures of construction, combination and arrangement of parts as willbe hereinafter more fully described in detail, illustrated in theaccompanying drawings, which disclose the preferred embodiment of theinvention, 2 and pointed out in the claim hereunto appended.

In the accompanying drawings:

Figure l is a side elevation of the screen constructed in accordancewith the invention.

Figure 2 is an end view thereof.

Figure 3 is a top plan View.

Figure 4 is a plan view of a modified form of screening tray.

Similar reference characters indicate corresponding parts throughout theseveral views in the drawings.

Referring to the drawings in detail, particular- 1y Figures 1 to 3,inclusive, the apparatus or device comprises a stand [0 having in itsupper por- 35 tion a power box I I, being inclined to the vertical inone direction and opening into the higher end thereof is an entrancespout [2. This spout I2 through a coupling 13 is separably attached to,

an outlet l4 connected to the flow pipe of a well drilling machine. Thespout I2 is detachable from the power box H.

A peripherally bladed wheel 15 is rotatably journaled in any suitablemanner in the box II for disposing its blades in a flow of material inthe said box below the axis of rotation of the said wheel so that thelatter will be driven by such flow of material.

Keyed or otherwise fixed to the journal l6 of the wheel I5 areeccentrics IT to which are strapped or suitably connected arms I8, thelatter being attached at I9 to a shaking screen tray carried in asupport 2|. The tray 20 is suspended by links 22 connected thereto andalso to the support 2| so that the said tray will be movably supportedat an incline.

Extending from the box H to a desired distance over one end of the tray2|] is an outwardly flared discharge plate 23 which delivers thematerial from the said box onto the screen tray.

Built in the support 2| is a catch pan 24 which extends beneath a majorportion of the screen tray and is provided with a lateral discharge 25at one side, the bottom 26 of the pan being inclined from the other sideand opposite ends in the direction of the discharge 257 The tray 20 hastherein a screening fabric 21.

In Figure 4 of the drawings there is shown a modification, wherein thescreening section 28 is longitudinally slotted as at 29 for screeningpurposes.

. What is claimed is: r

In an apparatus of the kind described, a box having an inclined bottom,a peripherally bladed wheel rotatably journaled in the box for disposingits blades in a flow of material in the box below the axis of rotationof said wheel for the driving thereof by said flow, eccentrics fixed tothe journal of the wheel, a shaking screen, a support for the screen,links connecting the screen to the support and movably supporting it atan. incline, an outwardly flared discharge plate extending from the boxto a distance over one end of the screen, connections between the screenand eccentrics for shaking said screen, .and a catch pan beneath a majorportion of the screen and having a lateral discharge at one side, thebottom of said pan being inclined from the other side and opposite endsin the direction of the discharge.

GLENWOOD D. CRABB.

